Pesticidal halogen-substituted pyrimidinyl phosphorus esters

ABSTRACT

HALOGEN-SUBSTITUTED PYRIMIDINYL PHOSPHORUS ESTERS WHICH ARE USEFUL AS PESTICIDES.

United States Patent U.S. Cl. 260-256.5 R 4 Claims ABSTRACT OF THE DISCLOSURE Halogen-substituted pyrimidinyl phosphorus which are useful as pesticides.

esters This invention relates to new, pesticidal, pyrimidine derivatives, to processes for making them, to compositions containing them and to methods for combating pests. The invention provides a pyrimidine derivative according to the general formula:

l INC/(OM34 N N OR,

and salts thereof,

wherein R is a hydrocarbyl or mercapto-hydrocarbyl radical or a substituted or unsubstituted amino group; R and R are atoms of hydrogen or of a halogen or are hydrocarbon radicals and at least one of R and R is an atom of a halogen; R and R are hydrocarbyl radicals; X is an atom of oxygen or sulphur and m is nought or one. More particularly the invention provides a pyrimidine derivative according to the general formula:

and salts thereof,

wherein R is an alkyl, alkylthio, alkoxycarbonylalkylthio, amino, formamido, acylamino, monoor di-alkylamino radical; R and R are atoms of chlorine or bromine or are alkyl radicals and at least one of R and R is an atom of chlorine or bromine; R and R are alkyl radicals and m is nought or one.

Especially useful compounds according to the invention are pyridimidine derivatives as defined above and wherein each ring substituent containing carbon atoms comprises from one to ten carbon atoms and preferably from 1 to 4 carbon atoms.

In a further aspect the invention provides a pyridimidine phosphate according to the general formula:

and salts thereof,

wherein R is an alkyl, alkylthio, amino or monoor dialkylamino radical containing from 1 to 10 carbon atoms; R and R are atoms of chlorine or bromine or are alkyl radicals containing from 1 to 10 carbon atoms, at least one of R and R being a chlorine or bromine atom; and R and R are alkyl radicals containing from 1 to 10 carbon atoms.

Particularly useful pyrimidine derivatives are those bearing a halogen atom at the 5-position of the pyrimidine ring, that is compounds having the above structural formula wherein R is an atom of a halogen.

As examples of suitable salts there may be mentioned both organic and inorganic salts, for example hydrochlorides, hydrogen sulphates, acetates, oxalates, formates, citrates and para-toluene sulphonates.

The invention particularly includes the specific pyrimidine derivatives set out in Table 1 below.

TABLE 1 Compound umber Structural formula Physical constant Viscous 011.

ll 2115) I I N 2115) a M.P. 104 C.

Low melting solid.

TABLE 1Continued TABLE 1Continued Compound Structural Physical Compound Structural Physical number formula constant number formula constant I S OCgH S 02H; CH: CHv-(S-O-i N N 00211 N N 2 v w SCQHK /N\ 9-- Cl n 1.5260. C2115 CzH5 l fi/o a a CHQ- 0P 1 In a further aspect, therefore, the invention provides l N OCH eigh of the compounds specifically enumerated 1n Table 1 a ve. V In this specification the numbering of the pyrimidine scH, ring is as follows:

m II/ I CH; -OP

N3 1N i N 001115 I It may be noted that the 4- and 6-pos1t1ons are quiv S CH: COOCaHs alent. 1 1 s 001m M.P. 7879 C. The compounds of this invention can be obtained by a c m o g number of different methods and in so far as these IJ methods are used to prepare them they are considered as N constituting further aspects of the invention. Thus one method of preparing the invention com- 1 0H0 pounds comprises bringing into reaction a 4- or 5-halo-2- amino-d-hydroxypyrimidine with a di-hydrocarbylhalothio 12 .r.... Cl M.P.113-114 C. phosphate or -phosphonate. The reaction is conveniently fi carried out in the presence of a condensing base, for Cl 0P example an alkali metal salt such as potassium carbonate, i \OCZHE sodium hydride, or sodium ethoxide and preferably in the N N presence of a solvent, for example ethyl acetate, dimethylformamide, toluene and benzene.

NH: After the reaction is complete the desired invention compound may conveniently be recovered from the mix- 13 1mm ture by pouring it into water particularly when sodium s 001115 hydride is used as the base and dimethyl formamide as {l the solvent and extracting the compound by dissolution A in an inert organic solvent or removing it by filtration.

N 0023 The compounds of the present invention are very toxic toward a variety of insect pests including mosquito larvae E (Aedes aegypti), black aphids (A phis fabae), green aphids (Megoura viciae), red spider mites (Tetranychus telarius), grain weevils (Calandra granaria), diamond back moth 14 31 0 0 C H caterpillars (Plutella maculipennis), mustard beetles 2 (Phaedon cochleariae), common housefiies (Musca d0- mestict) and root knot nematodes (Melodigyne incog- N L 00 11, nita). The compounds of the invention also possess antifungal properties and in particular, may be used to combat the following specific diseases: wheat rust (Puccinia recondita), rice blast (Piricularia oryzae), apple powdery C1 21 mildew (Podosphaera leucotricha), vine downy mildew I E OCZHI! (Plasmopara viticola), cucumber powdery mildew (Spham o p erotheca fuliginea), wheat and barley powdery mildews J N O 02H (Erysipha graminis) and apple scab (Venlurz'a inaequalis). A part1cularly useful feature of the activity of the invention compounds is the ability of some of them to act M0113), 5 individually as systemic pesticides, that is to say, their ability for example, to move in a plant to combat a 16": 01 1D,; 1.548% fungal infection or insect infestation thereon remote from s G235 a site of initial application of a compound. Thus a com- CH: JL/ pound of the invention, or a composition containing the J same, may be applied to the soil surrounding the roots N OCH; of a plant and taken up by the plant through its roots to combat pests on the plant.

The invention, accordingly, further consists in pesticidal 0 \U H compositions comprising as an active ingredient a compound as hereinbefore defined.

In use the invention compounds, and compositions containing them, may be applied in a variety of ways. Thus their application can be directly onto pests themselves or to a pest hibitat. In so far as plants are concerned the whole plant, or parts thereof affected by a pest, may be treated. Alternatively, the application of the compounds (and compositions) may be to the locus of the plant; for example the soil used to grow the plant may be treated.

Alternatively, or in addition, seeds of plants may be treated, and for this purpose the soil in which the seeds are to be sown, or in which they are germinating, can be treated.

In a furthur aspect, therefore, the invention provides a process of combating pests which comprises applying to a habitat of, or directly to, the pests, or to the locus of a plant, or seeds thereof, or to plants or seeds themselves a compound or a composition as hereinbefore defined.

The compounds and compositions of the invention may be used for agricultural or horticultural purposes and the compound or type of composition used in any instance will depend upon the particular purpose for which it is to be used.

Compositions comprising the invention compounds may be in the form of dusting powders or granules wherein the active ingredient is mixed with a solid diluent or carrier. Suitable solid diluents or carriers may be, for example, koalin, bentonite, kieselguhr, dolomite, calcium carbonate, talc, powdered magnesia, fullers earth, gypsum. Hewitts earth, diatomaceous earth and china clay. Compositions for dressing seed, for example, may comprise an agent assisting the adhesion of the composition to the seed, for example, a mineral oil.

The compositions may also be in the form of dispersible powders or grains comprising, in addition to the active ingredient, a wetting agent to facilitate the dispersion of the powders or grains in liquids. Such powders or grains may include fillers, suspending agents and the like.

The compositions may also be in the form of liquid preparations to be used as dips or sprays which are generally aqueous dispersions or emulsions containing the active ingredient in the presence of one or more wetting agents, dispersing agents, emulsifying agents or suspending agents.

Wetting agents, dispersing agents and emulsifying agents may be of the cationic, anionic or non-ionic type. Suitable agents of the cationic type include, for example, cetyltrimethylammonium bromide. Suitable agents of the anionic type include, for example, soaps, salts of aliphatic monoesters of sulphuric acid, for example sodium lauryl sulphate, salts of sulphonated aromatic compounds, for examples sodium dodecylbenzenesulphonate, sodium, calcium or ammonium lignosulphonate, butylnaphthalene sulphonate, and a mixture of the sodium salts of diisopropyland triisopropylnaphthalene sulponic acids.

Suitable agents of the non-ionic type include, for example, the condensation products of ethylene oxide with fatty alcohols such as oleyl alcohol or cetyl alcohol, or with alkyl phenols such as octylphenol, nonylphenol and octylcresol. Other non-ionic agents are the partial esters derived from long chain fatty acids and hexitol anhydrides, and condensation products of the said partial esters with ethylene oxide, and the lecithins.

Suitable suspending agents are, for example, hydrophilic colloids, for example polyvinylpyrrolidone and sodium carboxymethylcellulose, and the vegetable gums, for example gum acacia and gum tragacanth.

The aqueous solutions, dispersions or emulsions may be prepared by dissolving the active ingredient or ingredients in an organic solvent which may contain one or more wetting, dispersing or emulsifying agents and then adding the mixture so obtained to water which may likewise contain one or more wetting, dispersing or emulsifying agents. Suitable organic solvents are ethylene dichloride, isopropyl alcohol, propylene glycol, diacetone alcohol,

toluene, kerosene, methylnaphthalene, xylenes and trichlorethylene.

The compounds of the invention may also be formulated in the form of capsules or microcapsules containing either the active compound itself, or a composition containing the active ingredient, and prepared by any of the known encapsulation or microencapsulation techniques.

The compositions to be used as sprays may also be in the form of aerosols wherein the formulation is held in a container under pressure in the presence of a popellant such as fluoro-trichloromethane or lichlorodifluoromethane.

By the inclusion of suitable additives, for example, for improving the distribution, adhesive power and resistance to rain on treated surfaces, the different compositions can be better adapted for the various uses for which they are intended.

The compounds may also be conveniently formulated by admixing them with fertilizers. A prefered composition of this type comprises granules of fertilizer material incorporating, for example coated with, a compound of the invention. The fertilizer material may, for example, comprise nitrogen or phosphate-containing substances.

In yet a further aspect of the invention, therefore, we provide a fertilizer comprising a compound as hereinbefore defined.

The compositions which are to be used in the form of aqueous dispersions or emulsions are generally supplied in the form of a concentrate containing a high proportion of the active ingredient or ingredients, the said concentrate to be diluted with water before use. These concentrates are often required to withstand storage for prolonged periods and after such storage, to be capable of dilution with water in order to form aqueous preparations which remain homogeneous for a sufficient time to enable them to be applied by conventional spray equipment. The concentrates may conveniently contain from 10-85% by weight of the active ingredient or ingredients, and generally from 2560% by weight of the active ingredient or ingredients. When diluted to form aqueous preparations, such preparations may contain varying amounts of the active ingredient or ingredients depending upon the purpose for which they are to be used, but an aqueous preparation containing between 0.001% and 1.0% by weight of active ingredient or ingredients may be used.

It is to be understood that the compositions of this invention may comprise, in addition to an invention compound, one or more other compounds having biological activity.

The invention is illustrated, but not limited, by the following examples.

EXAMPLE 1 This example illustrates the preparation of 0,0-diethyl (4 chloro 2 dimethylamino-6-pyrimidinyl) thiophosphate of structural formula:

CH CH (Compound No. l of Table l) 3.5 gm. (0.02 mole) of 4-chloro 2 dimethylamino-G-hydroxypyrimidine and 4.2 gm. (0.03 mole) anhydrous potassium carbonate are suspended in ml. dry ethyl acetate and 3.8 gm. (0.02 mole) diethyl chlorothiophosphate added slowly. The mixture is then refluxed overnight, cooled and evaporated to dryness. The residue is then dissolved in toluene, washed with 5% aqueous sodium hydroxide solution and then with water until the washings are neutral to litmus paper. On drying and evaporating the solution, an oil is obtained which is heated under high vacuum for 30 minutes to remove volatile materials.

EXAMPLE 2 This example illustrates the preparation of the compound having the structural formula:

| O OC H N N OCaHs I I(CH )2 (Compound No. 4 of Table 1) Sodium (0.46 g. 0.02 mol.) was dissolved in ethanol (15 ml.) followed by 5-bromo-2-dimethylamino-6-hydroxy-4- methyl pyrimidine (4.6 g. 0.02 mol.). After stirring for a few minutes the ethanol was striped oil and the sodium salt of the pyrimidine was suspended in dry toluene (15 ml.) and diethyl chlorophosphate added. The mixture was heated under reflux for 4 hours. The reaction mixture was then washed with dilute alkali, then with water and finally dried over anhydrous sodium sulphate. The toluene was evaporated and the oil obtained was heated on a steam bath under high vacuum (0.1 mm.) for a quarter of an hour to yield the product.

EXAMPLE 3 (Compound No. 13 of Table l) 4-chloro-2-methyl-6-hydroxypyrimidine (1.8 g. 0.0125 mole) and potassium carbonate (2.8 g. 0.02 mole) were suspended in ethyl acetate (50 ml.) dried by magnesium sulphate and the mixture was stirred for 15 minutes. The chlorothiophosphate (2.35 g. 0.0125 mole) was then added dropwise and the mixture stirred at refluxing temperatures for 22 hours. It was then allowed to cool and evaporated to dryness. The semi-solid residue was dissolved in toluene, washed firstly with 10% aqueous sodium hydroxide four times using 10 ml. aliquots and then with water until the washings were neutral to litmus. The washed residue was then dried over magnesium sulphate, and the toluene removed in vacuo to yield a pale yellow oil, yield 2.3 'g., which was heated for 1 hour at 50 C. and 0.5 mm. pressure to remove volatile matter. Yield 1.9 g. 11 1.5120.

EXAMPLE 4 This example illustrates the preparation of 0,0-diethyl (5 chloro 4-methyI-Z-ethylthiopyrimid-6-yl) thiophosphate, having the structural formula:

I S ()C lls ll H I OP\ N \jq 2 I SU ll; (Compound No. ti oi Table l) This compound was prepared by a similar procedure to that recited in the preceding example using the following reactants.

5-chloro-2-ethylthio-6-hydroxy-4-methylpyrimidine (2.6 g.

0.015 mole).

Potassium carbonate (3.4 g. 0.025 mole).

Diethyl chlorothiophosphate (2.8 g. 0.015 mole).

Ethyl acetate (MgSO dried) (60 ml.).

Yield 1.1 g. n 1.540s.

EXAMPLE 5 Using the appropriate starting substances and appropriate methods of preparation similar to those described in Examples 1 to 4 above the compound numbered 2, 3, 5, 6, 7, 9, 10, l1, l2, 14, 15, 16 and 17 in Table 1 above were prepared.

EXAMPLE 6 This example illustrates a concentrate comprising a miscible oil which is readily convertible by dilution with water into a liquid preparation suitable for spraying purposes. The concentrate has the following composition:

Percent weight Compound No. l of Table l 25.0 Lubrol L (alkylphenol/ethylene oxide condensate; Lubrol is a trademark) 2.5 Calcium dodecylbenzenesulphonate 2.5 Aromasol H (alkylbenzene solvent; Aromasol is a trademark) 70.0

EXAMPLE 7 This example also illustrates a concentrate which is in the form of a miscible oil. The composition of this concentrate is as follows:

Percent wt.

Compound No. 5 of Table l 25.0 Lubrol L (Lubrol is a trademark) 4.0 Calicum dodecylbenzenesulphonate 6.0 Aromasol H (Aromasol is a trademark) 65.0

EXAMPLE 8 This example illustrates a wettable powder having the following composition:

Percent wt.

Compound No. 6 of Table l 25.0 Sodium silicate 5.0 Calcium lignosulphonate 5.0 China clay 65.0

EXAMPLE 9' This example illustrates an atomisable fluid comprising a mixture consisting of 25% by weight of the compound No. 8 of Table 1 and by weight of xylene.

EXAMPLE 10 This example illustrates a dusting powder which may be applied directly to plants or other surfaces and comprises 1% by weight of the compound No. 5 of Table 1 and 99% by weight of talc.

EXAMPLE I l 25 parts by weight of the product described in Example l, 65 parts by weight of xylene, and 10 parts of an alkyl aryl polyether alcohol (Triton X-100; Triton is a trademark) were mixed in a suitable mixer.

9 EXAMPLE 12 The ingredients listed below were ground together in the proportions stated to produce a powdered mixture readily dispersible in liquids.

EXAMPLE 16 A formulation was prepared by mixing and grinding the ingredients recited below in the proportions stated.

Percent wt.

Compound No 7 of Table 1 Percent gomlpound 3 of Table 1 ou ac Dlspersol T 5 Water 50 China clay 45 100 f EXAMPLE 13 The toxicitydof a number off the ctzmpollnds of this 1: 1 vention towar a vane y o 1nsec pes s was inves 1- z i g g gg s s g s gg piggi g f s g gated and the tests conducted and results obtained are set out below. The compounds of the invention were in each i g g g i igg ig g ififi 2:1222 15 case used in the form of a liquid preparation containing m e P i Ce {1 adlixture was dried and assed 0.1% by weight of the compound. The preparations were g g ii. h gtand rd mesh Sieve Siz 444%0 to made by dissolving each of the compounds in a mixture of l d solvents consisting of 2 parts by volume of acetone and 2 o tam t e eslre size 0 grams P Ht Wt parts by volume of ethyl alcohol. C d N 5 f T bl 1 area so 0 The solutions were then diluted with water containing i i T o a e 12 5 0.01% by weight of a wetting agent sold under the trade Gislplerso name of Lissapol NX until the liquid preparations d d l h at 12 5 contained the required concentration of the compound enzenesu p on e (LissapOF is a trademark).

0 mm ace a e The test procedure adopted with regard to each test 100 0 insect was basically the same and comprised supporting 3. EXAMPLE 14 number of insects on some medium which may be a host plant or some foodstuif on which the insect feeds, A composition suitable for use as a seed dressing was and treating either or both the insects and the medium prepared by mixing all three of the ingredients set out Wlth the p p h The lhoftahty 0f the lllseets was b l i h proportions t t d, then assessed at perlods varying from one to three days Percent wt. after the treatment. Compound No. 4 of Table 1 80 The e ults of the tests are given below in Table II. Mineral oil 2 In this table the first column indicates the compound used. China clay 18 Each of the subsequent columns indicates the name of the test insects, the host plant or medium on which it was sup- 100 ported and the number of days which were allowed to EXAMPLE 15 elapse after treatment before assessing the percentage of A l ar d y dissolving the 40 insects which had been killed. The assessment is expressed gram ar compo 10H was Prep 6 in inte ers which ran e from 0 to 3. active ingredient in a solvent, spraying the solution obg tained onto the granules of pumice and allowing the Ofepfesehtsless than 30% 9 solvent to evaporate 1 represents from 30-49% kill P 2 represents from -90% kill C d N 2 of Tabl 1 cent 45 3 represents over kill ompoun o. e Pumice granules The concentration of the invention compound in the solutions used was 1,000 parts per million for all the pests except Aedes aegypti which was 10 parts per million.

TABLE II T! k- T! k- Pl tll Pll d C'alandra Pz'en's Aedes Aphis Megoura e li us e li us m ctil c oc i Musca Meloidogzme granatm brassicae aegkpti fabae viciae telarius telarius pennis Zeariea domestica incognito White cabbage Bed Bed Diamond Grain butterfly Mosquito Blaek Green spider spider back Mustard Root knot weevil larvae larva aphid aphid mite egg moth beetle Housefly nematode Milk and S11 Compound Wheat Cabbage Broad Broad French French Mustard Mustard] cott gr i N0. Table I seeds leaf Water bean bean bean bean plant paper wool Tomato 14-1811 5 3 days 24 hours 2 days 2 days 3 days 8 days 2 days 1 day In viii' o N.B.--" means not; tested.

11 12 Compositions according to the invention were made up 4 N in the following manner and tested in different ways 23 against various foliarborne fungal diseases. The procedure adopted for each test is described below.

An aqueous solution or suspension containing 500 parts 5 per million (p.p.m.) of the compound under test and suit- Venturia inaequalis (Scab) Q m Q.

able either for drenching the soil surrounding growing plants, or for spraying onto the leaves of cucumber, vine or apple plants is obtained by adding water to a solution a i of the compound (200 mg.) in acetone (1 ml.) until the E m 3 total volume of the mixture is 400 ml. An aqueous solua a coo tion or suspension suitable for spraying onto the leaves of gig wheat, barley or rice plants is prepared similarly, but ing8, I stead of water, 0.1% volume/volume aqueous solution of E the polyoxyethylenesorbitan monolaurate wetting agent, 0 m Tween 20, is used (Tween is a trademark). a (1 an m (A) Spray-applied protectant test (P.S.A.) $5 A suspension or solution containing 500 p.p.m. of the Q E active compound was sprayed directly onto the leaves of g; E plants, a wetting agent being used when the plant was E35 5, wheat, barley or rice. After 24 hours the plant was inocu- E lated with the fungus under test and after a suitable period 25 f of time (time interval Asee table below) depending .f a E upon the particular plant and fungus, the extent of infec- E tion was assessed visually. a 2 m i (B) Drench-applied protectant test (P.R.D.) E

Q4 I A suspension or solution containing 500 p.p.m. of the 5?, 3E active compound was applied to the soil surrounding the n t 5 plant under test, and 48 hours later the plant was inocu- E lated with the fungus. The extent of infection was assessed 55 j E visually after a period of time (time interval B-see table H H E below) depending upon the plant and the fungus. Q A Di 1 (C) Spray-applied eradicant test (E.S.A.) f E- 2% 1 The plants were inoculated with the fungus under test, i i and 24 hours later the liquid preparation containing 500 E1 3 p.p.m. of the active compound was sprayed onto the leaves 5% E of the plants as described under A above. After a further "g? H E period of time (time interval C-see table below), again a 5 depending upon the particular plant and fungus, the extent ,8 El E of infection was assessed visually. a g d 5 a i a E 8'. g NOFIQOO Time interval (days) 5 5 Ct oc Disease and plant A and B C E5 E5 Puccinia recondlta (wheat) 10 g 1% Sphaerotlieca fuliginea (cucumber 7 6 gm 4 r-(OHQfl Eryslphe graminis (wheat) 7 6 of a Erysiphe gramims (barley) 7 6 w Podosphaera lcucotrieha (apple) 10 9 Plasmopara viticola (vine) 7 Piricularia oryzae (rice) 7 6 (50 4 1 I l I Vonturla inaequalls (apple) 21 20 g a a i E a 5 a a s a g g g a s is a 5 s s i 2 s a 5 E 5 i a: a 5 2 s a s The results of the tests are set out in Table III below the i E E E 5 amount of disease being expressed as a grading giving the i i 5 5 percentage amount of disease: E i 5 Grading: Percentage amount of disease E E 0 61 to 100 3 E 5 i E 1 26 to 60 E E i i E 2 6 to 25 o 5 E 5 l 3 We claim: 1. A pyrimidine derivative selected from the group consisting of compounds of the formula:

and the acid-addition salts thereof, wherein R is amino, dimethylamino, diethylamino, formamido, ethoxycarbonylmethylthio, methylthio, ethylthio, or methyl; R is hydrogen, methyl or chloro; R is hydrogen, chloro or bromo; R and R are methyl or ethyl; X is sulphur or oxygen; and m has the value zero or one; provided that at least one of R and R is a halogen atom.

2. A pyrimidine derivative according to claim 1 wherein R is dimethylamino or diethylamino; R is methyl; R is chloro; R and R are methyl or ethyl; X is sulphur or oxygen; and in has the value one.

References Cited UNITED STATES PATENTS 3,287,453 11/1966 McHattie 260256.5 3,378,565 4/1968 Rigterink 424200 3,432,519 3/1969 McTevier et al. 424-200 3,467,655 9/1969 Nakanishi et a1 424-200 3,496,178 2/1970 Scherer et al 424200 ALEX MAZEL, Primary Examiner R. I. GALLAGHER, Assistant Examiner US. Cl. X.R. 

